code: def test_exog_names_warning(self):
      mod = self.res.model
      mod1 = PoissonOffsetGMLE(mod.endog, mod.exog, offset=mod.offset)
      from numpy.testing import assert_warns
  
      mod1.data.xnames = mod1.data.xnames * 2
      assert_warns(ValueWarning, mod1.fit, disp=0)
  
imports: import pytest
  import numpy
  from numpy.testing import assert_almost_equal
  from scipy import stats
  import statsmodels.api
  from statsmodels.miscmodels.count import PoissonGMLE, PoissonOffsetGMLE, PoissonZiGMLE
  from statsmodels.discrete.discrete_model import Poisson
  from statsmodels.tools.sm_exceptions import ValueWarning
label_desc: Use image node_id 4 for calling the TestPoissonZi obj's underlying member method code with example usage: obj.test_exog_names_warning() without return types